The Buyback Achievers Index is designed to track the performance of companies that are incorporated in the United States, trade on: NYSE or NASDAQ and have repurchased 5% or more of its common stock in the trailing 12 months. The Index is reconstituted annually and rebalanced on a quarterly basis. The Index is calculated using a modified market capitalization weighting methodology and is published by the American Stock Exchange under ticker symbol DRB.

US Universe
Select US companies with a Share Buyback Factor (SBF) of -5 (i.e., have repurchased at least 5% of their outstanding shares) or less for the trailing 12 months ended December 31 each year. US companies must be listed on the NYSE or NASDAQ.

General Index Rules
The index is weighted using a modified market capitalization methodology. No company may comprise more than 5% of the index. The index is reconstituted annually on the last trading date in January based on the constituents' market capitalization as of the last trading date in December. The weight of each company will float between reconstitution and rebalance dates thus it is possible for a company to weigh more than 5% between these periods. The index is rebalanced quarterly on the last trading date in April, July and October. The rebalanced weights for April, July and October will be based on their market capitalizations as of the last trading date in March, June, and September, respectively. In the event of a corporate action or payment of a special dividend, the index divisor will be adjusted to reflect the changes.